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GEORGE WV. WOODWARD, OF BROOKLYN, ASSIGNOR TO THE ANSONIA BRASS AND COPPER COMPANY, OF NEW YORK, N. Y.

t LAMP.

SPECIFICATION forming part of Letters Patent No. 539,467, dated May 21, 1895. Application filed $eptember 7, 1889. Serial No. 323,273. (No model.

. To all whom it may concern.-

Be it known that I", GEORGE W. W001)- WARD, of Brooklyn, Kings county, and State of New York, have invented a certain new and useful Improvement in Lamps, of which the following is a specification.

. My improvement relates to Argand lamps of the kind having combined with the central draft tubes thimbles which are perforated above the tubes to distribute air to the inner surface of the flames.

The object of my improvement is to provide a simple and effective manner of combining such a thimble with the central tube of a lamp.

The improvement consists in the combina-\ tion with the central tube in an Argand lamp, of athimble supported by a projection extending from the central tube and having a circumferential bead which fits within the upper part of the central tube.

In the accompanying drawings, Figure 1 represents a central vertical section of the 11pper portion of the wick-tube of an Argand lamp and a thimble embodying my improvement. Fig. 2 is a side view of the thimble. Fig. 3 is a top view of the thimble. Fig. 4 is a bottom view of the thimble. Fig. 5 is atop view of the Wick-tube.

Similar letters and numerals of reference designate corresponding parts in all the figures.

A A designate two cylindric shells arranged one concentrically within the other so as to leave between them a space capable of accommodating a circular Wick. The inner rate at the top. The bottom is entirely open and the bottom edge rests upon the horizontal portion of the shelf or projection a. In this way the thimble is supported vertically. It will be seen that the thimble extends considerably above the tip of the tube A. This enables it to distribute air, rising through the central draft tube, upon the inner surface of the flame. This thimble has a circumferential bead b, which, it will be seen, extends entirely around it and has its greatest projection at a point about level with the tip of the tube A and is perforated in all its parts. It is, however, essential to my improvement that the bead shall be of suoh'diameter as that it will fit within the tube A and that it shall be located at the upper portion of the tube A, and within said tube.

I do not wish to here lay claim to a thimble having a bead made of such diameter as that it will rest upon the top of the central draft tube in an Argand lamp. A head fitting within the upper portion of the central tube is, in many respects, advantageous. It steadies and maintains the thimble at an upright position without being liable to interfere with the Wick. It prevents dirt and like matter from the wick from falling into the central tube. It does not divert the draft passing up through the central tube as do a number of isolated proj ections extending from a thimble into contact with the central draft tube. When the bead is perforated, air passing into the space between the lower portion of the thimble and the Wick tube may pass through the bead at a great number of points and out .of the bead to the flame. If the bead does not fit closely within the central draft tube air may, of course, escape between it and the tube into the flame.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. The combination with the central draft tube of an Argand lamp, of a perforated thimble having a circumferential bead fitting against theinner surface of said central draft tube, and having its greatest projection at a level with the top of said tube and perforated in all its parts, substantially as specified.

2. The combination with the central draft tube of an Argand lamp, of a perforated thimble having a perforated circumferential bead fitting against the inner surface of said central draft tube, and having its greatest protube, and having its greatest projection at a jection on a level with the top of said tube, level With the top of said tube, substantially substantially as described. as specified.

3. The combination with the central draft GEORGE W. VVOODi/VARD. 5 tube of an Argand lamp, of a perforated thim- Vitnesses:

ble having a circumferential bead fitting EDWIN I-I. BROWN,

against the inner surface of said central draft NM. M. ILIFF. 

